@AstronomyVibes It may be a conceptual mistake. If the Big Bang marks the beginning of spacetime itself, then time began with the Big Bang. Since "before" is a temporal concept, asking what existed "before" the Big Bang may be like asking what is north of the North Pole.
@Chaos_Mannequin@usanewshq Maybe it's because you saw the trees close to the car moving backward very quickly, so you thought he was accelerating. Besides, if he were accelerating, he wouldn't be asking "50kph or not."
@Chaos_Mannequin@usanewshq The car did accelerate before the video started — that’s correct. However, what the video shows is the stable hovering after the car has already reached constant speed. At that point, the car’s velocity is constant (e.g. 50 km/h), so its acceleration is 0.
@Chaos_Mannequin@usanewshq The video demonstrates the situation during constant-speed (uniform velocity) driving. The shared inertial frame maintains a constant speed of 50 km/h with no change, so the ACCELERATION IS 0.
@Chaos_Mannequin@usanewshq No, the propellers of a typical quadcopter drone generate lift by PUSHING AIR downward (via action-reaction forces). In a vacuum, there are no air molecules to push against, so even if the propellers spin at full speed, they produce no lift or control force.
@usanewshq In a CLOSED car, the air moves forward with the car at roughly the same speed, forming a shared inertial frame. The drone only needs to counteract gravity to remain stationary relative to the car (and travel forward with it).